bump version.

update appveyor

fix package version

Merge pull request AvaloniaUI#70 from AvaloniaUI/avalonia7

Upgrade to Avalonia 0.7

Merge pull request AvaloniaUI#44 from danwalmsley/editor-performance

Editor performance & Update to Avalonia Beta1 (0.6.0)

Merge pull request AvaloniaUI#41 from danwalmsley/netstandard1.3

Netstandard1.3

Merge pull request AvaloniaUI#32 from danwalmsley/updateavalonia

Updates and Fixes in preparation for coming avalonia updates

Merge pull request AvaloniaUI#22 from danwalmsley/fix-publish-nugets

fix publish on tags.

Merge pull request AvaloniaUI#22 from danwalmsley/fix-publish-nugets

fix publish on tags.